Scala Topic类代码示例

//设置package包名称以及导入依赖的类
package sample.helloworld.impl

import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import sample.helloworld.api.model.GreetingMessage
import sample.helloworld.api.HelloService


class HelloServiceImpl(persistentEntityRegistry: PersistentEntityRegistry) extends HelloService {

  override def hello(id: String) = ServiceCall { _ =>
    // Look up the Hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Ask the entity the Hello command.
    ref.ask(Hello(id, None))
  }

  override def useGreeting(id: String) = ServiceCall { request =>
    // Look up the Hello entity for the given ID.
         val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Tell the entity to use the greeting message specified.
    ref.ask(UseGreetingMessage(request.message))
  }

  override def greetingsTopic(): Topic[GreetingMessage] = {
    TopicProducer.singleStreamWithOffset {
      offset =>
        persistentEntityRegistry.eventStream(HelloEventTag.instance, offset)
          .map(ev => (convertEvent(ev), offset))
    }
  }

  private def convertEvent(helloEvent: EventStreamElement[HelloEvent]): GreetingMessage = {
    helloEvent.event match {
      case GreetingMessageChanged(msg) => GreetingMessage(msg)
    }
  }

} 

//设置package包名称以及导入依赖的类
package sample.helloworld.api

import akka.{Done, NotUsed}
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.api.{Service, ServiceCall}
import sample.helloworld.api.model.GreetingMessage


  def useGreeting(id: String): ServiceCall[GreetingMessage, Done]

  override final def descriptor = {
    import Service._
    // @formatter:off
    named("hello").withCalls(
      pathCall("/api/hello/:id", hello _),
      pathCall("/api/hello/:id", useGreeting _)
    ).withTopics(
          topic(HelloService.TOPIC_NAME, greetingsTopic)
     ).withAutoAcl(true)
    // @formatter:on
  }

  // The topic handle
  def greetingsTopic(): Topic[GreetingMessage]
}

object HelloService  {
  val TOPIC_NAME = "wordCount"
} 

//设置package包名称以及导入依赖的类
package demo.api.basket

import akka.NotUsed
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.api.{Descriptor, Service, ServiceCall}
import com.lightbend.lagom.scaladsl.api.transport._
import demo.api.basket.ExtraTransportExceptions.CustomExceptionSerializer
import play.api.Environment
import play.api.libs.json.{Format, Json}

case class Item(name: String, price: Int)
object Item {
  implicit val itemFormat: Format[Item] = Json.format
}

case class Basket(items: Seq[Item], total: Int)
object Basket {
  implicit val basketFormat: Format[Basket] = Json.format
}

case class OrderPlaced(basketId: String, basket: Basket)
object OrderPlaced {
  implicit val orderPlacedFormat: Format[OrderPlaced] = Json.format
}

trait BasketService extends Service {
  def getBasket(basketId: String): ServiceCall[NotUsed, Basket]
  def getTotal(basketId: String): ServiceCall[NotUsed, Int]
  def addItem(basketId: String): ServiceCall[Item, NotUsed]
  def clearAll(basketId: String): ServiceCall[NotUsed, NotUsed]
  def placeOrder(basketId: String): ServiceCall[NotUsed, NotUsed]
  def placedOrders: Topic[OrderPlaced]

  override def descriptor: Descriptor = {
    import Method._
    import Service._

    named("basket").withCalls(
      restCall(GET, "/basket/:basketId", getBasket _),
      restCall(GET, "/basket/:basketId/total", getTotal _),
      restCall(POST, "/basket/:basketId/items", addItem _),
      restCall(DELETE, "/basket/:basketId/items", clearAll _),
      restCall(POST, "/basket/:basketId/order", placeOrder _)
    ).withTopics(
      topic("placed-orders", placedOrders)
    ).withExceptionSerializer(new CustomExceptionSerializer(Environment.simple()))
  }
} 

//设置package包名称以及导入依赖的类
package demo.impl.basket

import akka.NotUsed
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity.InvalidCommandException
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import demo.api.basket.{Basket, BasketService, ExtraTransportExceptions, Item}

import scala.collection.immutable
import scala.concurrent.ExecutionContext

class BasketServiceImpl(persistentEntities: PersistentEntityRegistry)(implicit ec: ExecutionContext)
  extends BasketService with ExtraTransportExceptions{
  override def getBasket(basketId: String): ServiceCall[NotUsed, Basket] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetBasket)
  }

  override def addItem(basketId: String): ServiceCall[Item, NotUsed] = ServiceCall { item =>
    persistentEntities.refFor[BasketEntity](basketId).ask(AddItem(item))
      .map(_ => NotUsed)
      .recoverWith {
        case e: InvalidCommandException => throw BadRequest(e.message)
      }
  }

  override def getTotal(basketId: String): ServiceCall[NotUsed, Int] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetTotal)
  }

  override def clearAll(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(ClearAll)
      .map(x => NotUsed)
      .recoverWith {
        case e: InvalidCommandException => throw BadRequest(e.message)
      }
  }

  override def placeOrder(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(PlaceOrder)
      .map(x => NotUsed)
      .recoverWith {
        case e: InvalidCommandException => throw BadRequest(e.message)
      }
  }

  override def placedOrders: Topic[demo.api.basket.OrderPlaced] =
      TopicProducer.taggedStreamWithOffset(BasketEntityEvent.Tag.allTags.to[immutable.Seq]) { (tag, offset) =>
        persistentEntities.eventStream(tag, offset).collect {
          case EventStreamElement(t, OrderPlaced(id, basket), o)  => {
            demo.api.basket.OrderPlaced(id, basket) -> o
          }
        }
    }
} 

//设置package包名称以及导入依赖的类
package demo.impl.basket

import akka.NotUsed
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity.InvalidCommandException
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import demo.api.basket.{Basket, BasketService, ExtraTransportExceptions, Item}

import scala.collection.immutable
import scala.concurrent.ExecutionContext

class BasketServiceImpl(persistentEntities: PersistentEntityRegistry)(implicit ec: ExecutionContext)
  extends BasketService with ExtraTransportExceptions{
  override def getBasket(basketId: String): ServiceCall[NotUsed, Basket] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetBasket)
  }

  override def addItem(basketId: String): ServiceCall[Item, NotUsed] = ServiceCall { item =>
    persistentEntities.refFor[BasketEntity](basketId).ask(AddItem(item))
      .map(_ => NotUsed)
      .recoverWith {
        case e: InvalidCommandException => throw BadRequest(e.message)
      }
  }

  override def getTotal(basketId: String): ServiceCall[NotUsed, Int] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetTotal)
  }

  override def clearAll(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(ClearAll)
      .map(x => NotUsed)
      .recoverWith {
        case e: InvalidCommandException => throw BadRequest(e.message)
      }
  }

  override def placeOrder(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(PlaceOrder).map(_ => NotUsed)
  }

  override def placedOrders: Topic[demo.api.basket.OrderPlaced] =
      TopicProducer.taggedStreamWithOffset(BasketEntityEvent.Tag.allTags.to[immutable.Seq]) { (tag, offset) =>
        persistentEntities.eventStream(tag, offset).collect {
          case EventStreamElement(t, OrderPlaced(id, basket), o)  => {
            demo.api.basket.OrderPlaced(id, basket) -> o
          }
        }
    }
} 

//设置package包名称以及导入依赖的类
package demo.api.basket

import akka.NotUsed
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.api.{Descriptor, Service, ServiceCall}
import com.lightbend.lagom.scaladsl.api.transport._
import play.api.libs.json.{Format, Json}

case class Item(name: String, price: Int)
object Item {
  implicit val itemFormat: Format[Item] = Json.format
}

case class Basket(items: Seq[Item], total: Int)
object Basket {
  implicit val basketFormat: Format[Basket] = Json.format
}

case class OrderPlaced(basketId: String, basket: Basket)
object OrderPlaced {
  implicit val orderPlacedFormat: Format[OrderPlaced] = Json.format
}

trait BasketService extends Service {
  def getBasket(basketId: String): ServiceCall[NotUsed, Basket]
  def getTotal(basketId: String): ServiceCall[NotUsed, Int]
  def addItem(basketId: String): ServiceCall[Item, NotUsed]
  def clearAll(basketId: String): ServiceCall[NotUsed, NotUsed]
  def placeOrder(basketId: String): ServiceCall[NotUsed, NotUsed]
  def placedOrders: Topic[OrderPlaced]

  override def descriptor: Descriptor = {
    import Method._
    import Service._

    named("basket").withCalls(
      restCall(GET, "/basket/:basketId", getBasket _),
      restCall(GET, "/basket/:basketId/total", getTotal _),
      restCall(POST, "/basket/:basketId/items", addItem _),
      restCall(DELETE, "/basket/:basketId/items", clearAll _),
      restCall(POST, "/basket/:basketId/order", placeOrder _)
    ).withTopics(
      topic("placed-orders", placedOrders)
    )
  }
} 

//设置package包名称以及导入依赖的类
package demo.impl.basket

import akka.NotUsed
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import demo.api.basket.{Basket, BasketService, Item}

import scala.collection.immutable
import scala.concurrent.ExecutionContext

class BasketServiceImpl(persistentEntities: PersistentEntityRegistry)(implicit ec: ExecutionContext)
  extends BasketService {
  override def getBasket(basketId: String): ServiceCall[NotUsed, Basket] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetBasket)
  }

  override def addItem(basketId: String): ServiceCall[Item, NotUsed] = ServiceCall { item =>
    persistentEntities.refFor[BasketEntity](basketId).ask(AddItem(item)).map(_ => NotUsed)
  }

  override def getTotal(basketId: String): ServiceCall[NotUsed, Int] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetTotal)
  }

  override def clearAll(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(ClearAll).map(x => NotUsed)
  }

  override def placeOrder(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(PlaceOrder).map(_ => NotUsed)
  }

  override def placedOrders: Topic[demo.api.basket.OrderPlaced] =
      TopicProducer.taggedStreamWithOffset(BasketEntityEvent.Tag.allTags.to[immutable.Seq]) { (tag, offset) =>
        persistentEntities.eventStream(tag, offset).collect {
          case EventStreamElement(t, OrderPlaced(id, basket), o)  => {
            demo.api.basket.OrderPlaced(id, basket) -> o
          }
        }
    }
} 

//设置package包名称以及导入依赖的类
package org.wex.cmsfs.monitor.api

import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.api.{Service, ServiceCall}

trait MonitorService extends Service {

  def createMonitor: ServiceCall[Monitor, Monitor]

  def monitorCollectEvents(): Topic[MonitorEvent]

  override final def descriptor = {
    import Service._
    named("monitor").withCalls(
      pathCall("/api/monitor", createMonitor _)
    ).withTopics(
      topic("monitor-collect", monitorCollectEvents)
    )
  }
} 

//设置package包名称以及导入依赖的类
package com.orion.add.impl

import akka.Done
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import com.orion.add.api
import com.orion.add.api.AddService


class AddServiceImpl(persistentEntityRegistry: PersistentEntityRegistry) extends AddService {
  override def add(): ServiceCall[api.AddNumber, String] = ServiceCall { request =>
    val ref = persistentEntityRegistry.refFor[NumberEntity]("constant")

    ref.ask(AddNumber(request.number))
  }

  override def curry(): ServiceCall[api.CurryWith, Done] = ServiceCall { request =>
    val ref = persistentEntityRegistry.refFor[NumberEntity]("constant")

    ref.ask(CurryWith(request.number))
  }

  override def additionTopic(): Topic[api.CurriedWith] =
    TopicProducer.singleStreamWithOffset {
      fromOffset =>
        persistentEntityRegistry.eventStream(NumberEvent.Tags, fromOffset)
        .map(ev => (convertEvent(ev), ev.offset))
    }

  private def convertEvent(numberEvent: EventStreamElement[NumberEvent]): api.CurriedWith = {
    numberEvent.event match {
      case CurriedWith(num) => api.CurriedWith(num)
    }
  }
} 

//设置package包名称以及导入依赖的类
package com.example.saga.api

import akka.{Done, NotUsed}
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.api.{Service, ServiceCall}
import play.api.libs.json.{Format, Json}


object SagaService{
  val EXONE_TOPIC_NAME = "sagaExOneEvents"
}

trait SagaService extends Service {


  def sageExOneEvents(): Topic[SagaExOneEvent]

  
  def begin: ServiceCall[SagaRequest, String]

  override final def descriptor = {
    import Service._
    // @formatter:off
    named("saga-lagom").withCalls(
      pathCall("/api/saga/:id", getResult _),
      pathCall("/api/saga", begin _)
    ).withTopics(
      topic(SagaService.EXONE_TOPIC_NAME, sageExOneEvents)
    ).withAutoAcl(true)
    // @formatter:on
  }
}

case class SagaRequest(id: String)
object SagaRequest {
  implicit val format: Format[SagaRequest] = Json.format[SagaRequest]
}


case class SagaResponse(id: String, value:String)
object SagaResponse {
  implicit val format: Format[SagaResponse] = Json.format[SagaResponse]
}


case class SagaExOneEvent(id: String)
object SagaExOneEvent {
  implicit val format: Format[SagaExOneEvent] = Json.format[SagaExOneEvent]
} 

//设置package包名称以及导入依赖的类
package com.example.exone.api

import com.lightbend.lagom.scaladsl.api.Service
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, AggregateEventTag, AggregateEventTagger}
import play.api.libs.json.{Format, Json}

object ExOneService {

  val TOPIC_NAME = "exoneEvents"

}


trait ExOneService extends Service {

  def exOneEvents(): Topic[ExOneEvent]

  override final def descriptor = {
    import Service._
    named("exonedocs").withTopics(
      topic(ExOneService.TOPIC_NAME, exOneEvents)
    ).withAutoAcl(true)
  }

}

case class ExOneEvent(id:String, value:String) extends AggregateEvent[ExOneEvent]{
  override def aggregateTag: AggregateEventTagger[ExOneEvent] = ExOneEvent.Tag
}
object ExOneEvent{
  val NumShards = 4
  val Tag = AggregateEventTag.sharded[ExOneEvent](4)
  implicit val format: Format[ExOneEvent] = Json.format[ExOneEvent]
} 

//设置package包名称以及导入依赖的类
package com.example.hello.impl

import com.example.hello.api
import com.example.hello.api.{HelloService}
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}


class HelloServiceImpl(persistentEntityRegistry: PersistentEntityRegistry) extends HelloService {

  override def hello(id: String) = ServiceCall { _ =>
    // Look up the Hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Ask the entity the Hello command.
    ref.ask(Hello(id))
  }

  override def useGreeting(id: String) = ServiceCall { request =>
    // Look up the Hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Tell the entity to use the greeting message specified.
    ref.ask(UseGreetingMessage(request.message))
  }


  override def greetingsTopic(): Topic[api.GreetingMessageChanged] =
    TopicProducer.singleStreamWithOffset {
      fromOffset =>
        persistentEntityRegistry.eventStream(HelloEvent.Tag, fromOffset)
          .map(ev => (convertEvent(ev), ev.offset))
    }

  private def convertEvent(helloEvent: EventStreamElement[HelloEvent]): api.GreetingMessageChanged = {
    helloEvent.event match {
      case GreetingMessageChanged(msg) => api.GreetingMessageChanged(helloEvent.entityId, msg)
    }
  }
} 

//设置package包名称以及导入依赖的类
package sample.helloworld.api

import akka.{Done, NotUsed}
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.api.{Descriptor, Service, ServiceCall}
import sample.helloworld.api.model.GreetingMessage


  def useGreeting(id: String): ServiceCall[GreetingMessage, Done]

  override final def descriptor: Descriptor = {
    import Service._
    // @formatter:off
    named("hello").withCalls(
      pathCall("/api/hello/:id", hello _),
      pathCall("/api/hello/:id", useGreeting _)
    ).withTopics(
          topic(HelloService.TOPIC_NAME, greetingsTopic)
     ).withAutoAcl(true)
    // @formatter:on
  }

  // The topic handle
  def greetingsTopic(): Topic[GreetingMessage]
}

object HelloService  {
  val TOPIC_NAME = "wordCount"
} 

//设置package包名称以及导入依赖的类
package sample.helloworld.impl

import akka.{Done, NotUsed}
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import sample.helloworld.api.model.GreetingMessage
import sample.helloworld.api.HelloService


class HelloServiceImpl(persistentEntityRegistry: PersistentEntityRegistry) extends HelloService {

  override def hello(id: String): ServiceCall[NotUsed, _root_.sample.helloworld.impl.Hello#ReplyType] = ServiceCall { _ =>
    // Look up the Hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Ask the entity the Hello command.
    ref.ask(Hello(id, None))
  }

  override def useGreeting(id: String): ServiceCall[GreetingMessage, Done] = ServiceCall { request =>
    // Look up the Hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Tell the entity to use the greeting message specified.
    ref.ask(UseGreetingMessage(request.message))
  }

  override def greetingsTopic(): Topic[GreetingMessage] = {
    TopicProducer.singleStreamWithOffset {
      offset =>
        persistentEntityRegistry.eventStream(HelloEventTag.instance, offset)
          .map(ev => (convertEvent(ev), offset))
    }
  }

  private def convertEvent(helloEvent: EventStreamElement[HelloEvent]): GreetingMessage = {
    helloEvent.event match {
      case GreetingMessageChanged(msg) => GreetingMessage(msg)
    }
  }

} 

//设置package包名称以及导入依赖的类
package com.onedrop.github.impl

import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import com.onedrop.github
import com.onedrop.github.api.GithubService


class GithubServiceImpl(persistentEntityRegistry: PersistentEntityRegistry) extends GithubService {

  override def getOrg(org: String) = ServiceCall { _ =>
    // Look up the github entity for the given ID.
    val ref = persistentEntityRegistry.refFor[GithubEntity](id)

    // Ask the entity the Hello command.
    ref.ask(Hello(id))
  }

  override def getMembers(org: String) = ServiceCall { request =>
    // Look up the github entity for the given ID.
    val ref = persistentEntityRegistry.refFor[GithubEntity](id)

    // Tell the entity to use the greeting message specified.
    ref.ask(UseGreetingMessage(request.message))
  }


  override def getRepos(org: String): Topic[github.api.GreetingMessageChanged] =
    TopicProducer.singleStreamWithOffset {
      fromOffset =>
        persistentEntityRegistry.eventStream(GithubEvent.Tag, fromOffset)
          .map(ev => (convertEvent(ev), ev.offset))
    }

  private def convertEvent(helloEvent: EventStreamElement[GithubEvent]): github.api.GreetingMessageChanged = {
    helloEvent.event match {
      case GreetingMessageChanged(msg) => github.api.GreetingMessageChanged(helloEvent.entityId, msg)
    }
  }
}